add comments guards

Author: heapwolf

README.md

@@ -10,6 +10,8 @@ this...
 
 ```c++
 int main () {
+  // ...
+
   source | through | sink;
   return 0;
 }

index.hxx

@@ -1,3 +1,6 @@
+#ifndef PUSH_STREAM_H
+#define PUSH_STREAM_H
+
 #include <string>
 #include <iostream>
 #include <vector>
@@ -35,3 +38,5 @@ Stream& operator | (Stream& source, Stream& sink) {
   sink.source->pipe();
   return sink;
 }
+
+#endif

test/index.cxx

@@ -14,6 +14,9 @@ using Buffer = std::vector<String>;
 
 using namespace Hyper::Util;
 
+//
+// A source stream implementation
+//
 struct Source : Stream {
   Buffer buf { "paper", "clips", "for", "sale" };
   size_t i = 0;
@@ -40,6 +43,9 @@ struct Source : Stream {
   }
 };
 
+//
+// A sink stream implementation
+//
 struct Sink : Stream {
   Buffer buf;
 
@@ -55,6 +61,9 @@ struct Sink : Stream {
   }
 };
 
+//
+// A through/transform stream implementation
+//
 struct Through : Stream {
   using Callback = std::function<String(String)>;
   Callback callback;
@@ -94,6 +103,9 @@ struct Through : Stream {
   }
 };
 
+//
+// An async source stream implementation
+//
 struct SourceAsync : Stream {
   std::ifstream file;
 
@@ -151,6 +163,9 @@ struct SourceAsync : Stream {
   }
 };
 
+//
+// Tests!
+//
 int main () {
   TAP::Test t;